cashco PTR-1 Посібник з монтажу, експлуатації та технічного обслуговування - Сторінка 2
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Друкувати сторінкуDO NOT HYDROSTATIC TEST THROUGH AN IN STALLED
UNIT; ISOLATE REGULATOR FROM TEST. The "OUTLET
RATING" as printed on the name plate is the rec om mend ed
"upper op er at ing limit" for the sens ing di a phragm. Higher
pres sures could cause internal dam age. In ad di tion, note
on the nameplate that the Inlet and Outlet pres sure and
temperature ratings are at different levels.
IV. PRINCIPLE OF OPERATION
1. When a loading pressure – P
the top side of a diaphragm, the outlet controlled
pressure – P
.90 – .98 of the loading pressure - P
Fluc tu a tions in P
deviation in P
sym pa thet ic ratio effect.) See Section VIII.
2. Movement occurs as pressure variations register
on the diaphragm. The registering pressure is the
V. STARTUP
1
Start with the block valves closed.
2. Rotate the adjusting screw of the unloader CCW
three revolutions to decrease the set point pres-
sure of the main regulator.
3. If it is a "hot" piping system, and equipped with
a bypass valve, slowly open the bypass valve
to preheat the system piping and to allow slow
ex pan sion of the piping. Closely monitor outlet
(down stream) pressure via gauge to ensure not
over-pressurizing. NOTE: If no bypass valve is
in stalled, extra caution should be used in starting
up a cold system; i.e. do everything slowly.
Do not walk away and leave a bypassed reg u la tor
unattended!
2
CAUTION
– is applied to
Load
– will balance at approximately
2
– Inlet Pressure will cause a
1
– Outlet Pressure due to inverse
2
CAUTION
Low Temp.
Probe
SECTION IV
outlet, P
pressure fluid op pos es di a phragm move ment.
As outlet pres sure drops, the loading pressure
push es the di a phragm down, opening the port; as
outlet pres sure increases, the diaphragm pushes
. (NOTE:
up and the port opening closes.
L
3. A diaphragm failure will tend to cause the reg u la tor
to fall below setpoint. A loss of loading pres sure
while inlet pressure is imposed will cause the
regulator to fail close.
SECTION V
4. Crack open the outlet (downstream) block valve
to approximately 10% full open.
5. Slowly open the inlet (upstream) block valve to
about 25% open. Rotate the adjusting screw on
the unloader CW to increase the setpoint pres-
sure if necessary until the main valve is flowing.
Observe the outlet pressure gauge to ensure not
overpressurizing.
6. Continue to slowly open the inlet (upstream) block
valve until fully open.
7. Continue to slowly open the outlet (downstream)
block valve, especially when the downstream pip-
ing system isn't pressurized. If the outlet (down-
stream) pressure exceeds the desired pres sure,
close the inlet block valve and go to Step 2. Close
bypass valve approximately 25%, and re peat
pro ce dure.
Back Pressure
Unloader & PI
Model PTR-1 - External Sense
Recommended Piping Schematic
For Pressure Reducing Regulator
With Low Temperature Probe
, or downstream pressure. The loading
2
IOM-PTR-1